Merge "Move files up to match upstream source structure."

1 files changed, 363 insertions, 0 deletions

diff --git a/backends/ia64_retval.c b/backends/ia64_retval.c
new file mode 100644
index 00000000..b5928c58
--- /dev/null
+++ b/backends/ia64_retval.c
@@ -0,0 +1,363 @@
+/* Function return value location for IA64 ABI.
+   Copyright (C) 2006-2010, 2014 Red Hat, Inc.
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <dwarf.h>
+
+#define BACKEND ia64_
+#include "libebl_CPU.h"
+
+
+/* r8, or pair r8, r9, or aggregate up to r8-r11.  */
+static const Dwarf_Op loc_intreg[] =
+  {
+    { .atom = DW_OP_reg8 }, { .atom = DW_OP_piece, .number = 8 },
+    { .atom = DW_OP_reg9 }, { .atom = DW_OP_piece, .number = 8 },
+    { .atom = DW_OP_reg10 }, { .atom = DW_OP_piece, .number = 8 },
+    { .atom = DW_OP_reg11 }, { .atom = DW_OP_piece, .number = 8 },
+  };
+#define nloc_intreg	1
+#define nloc_intregs(n)	(2 * (n))
+
+/* f8, or aggregate up to f8-f15.  */
+#define DEFINE_FPREG(size) 						      \
+  static const Dwarf_Op loc_fpreg_##size[] =				      \
+    {									      \
+      { .atom = DW_OP_regx, .number = 128 + 8 },			      \
+      { .atom = DW_OP_piece, .number = size },				      \
+      { .atom = DW_OP_regx, .number = 128 + 9 },			      \
+      { .atom = DW_OP_piece, .number = size },				      \
+      { .atom = DW_OP_regx, .number = 128 + 10 },			      \
+      { .atom = DW_OP_piece, .number = size },				      \
+      { .atom = DW_OP_regx, .number = 128 + 11 },			      \
+      { .atom = DW_OP_piece, .number = size },				      \
+      { .atom = DW_OP_regx, .number = 128 + 12 },			      \
+      { .atom = DW_OP_piece, .number = size },				      \
+      { .atom = DW_OP_regx, .number = 128 + 13 },			      \
+      { .atom = DW_OP_piece, .number = size },				      \
+      { .atom = DW_OP_regx, .number = 128 + 14 },			      \
+      { .atom = DW_OP_piece, .number = size },				      \
+      { .atom = DW_OP_regx, .number = 128 + 15 },			      \
+      { .atom = DW_OP_piece, .number = size },				      \
+    }
+#define nloc_fpreg	1
+#define nloc_fpregs(n)	(2 * (n))
+
+DEFINE_FPREG (4);
+DEFINE_FPREG (8);
+DEFINE_FPREG (10);
+
+#undef DEFINE_FPREG
+
+
+/* The return value is a structure and is actually stored in stack space
+   passed in a hidden argument by the caller.  But, the compiler
+   helpfully returns the address of that space in r8.  */
+static const Dwarf_Op loc_aggregate[] =
+  {
+    { .atom = DW_OP_breg8, .number = 0 }
+  };
+#define nloc_aggregate 1
+
+
+/* If this type is an HFA small enough to be returned in FP registers,
+   return the number of registers to use.  Otherwise 9, or -1 for errors.  */
+static int
+hfa_type (Dwarf_Die *typedie, Dwarf_Word size,
+	  const Dwarf_Op **locp, int fpregs_used)
+{
+  /* Descend the type structure, counting elements and finding their types.
+     If we find a datum that's not an FP type (and not quad FP), punt.
+     If we find a datum that's not the same FP type as the first datum, punt.
+     If we count more than eight total homogeneous FP data, punt.  */
+
+  inline int hfa (const Dwarf_Op *loc, int nregs)
+    {
+      if (fpregs_used == 0)
+	*locp = loc;
+      else if (*locp != loc)
+	return 9;
+      return fpregs_used + nregs;
+    }
+
+  int tag = DWARF_TAG_OR_RETURN (typedie);
+  switch (tag)
+    {
+      Dwarf_Attribute attr_mem;
+
+    case -1:
+      return -1;
+
+    case DW_TAG_base_type:;
+      Dwarf_Word encoding;
+      if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
+						 &attr_mem), &encoding) != 0)
+	return -1;
+
+      switch (encoding)
+	{
+	case DW_ATE_float:
+	  switch (size)
+	    {
+	    case 4:		/* float */
+	      return hfa (loc_fpreg_4, 1);
+	    case 8:		/* double */
+	      return hfa (loc_fpreg_8, 1);
+	    case 10:       /* x86-style long double, not really used */
+	      return hfa (loc_fpreg_10, 1);
+	    }
+	  break;
+
+	case DW_ATE_complex_float:
+	  switch (size)
+	    {
+	    case 4 * 2:	/* complex float */
+	      return hfa (loc_fpreg_4, 2);
+	    case 8 * 2:	/* complex double */
+	      return hfa (loc_fpreg_8, 2);
+	    case 10 * 2:	/* complex long double (x86-style) */
+	      return hfa (loc_fpreg_10, 2);
+	    }
+	  break;
+	}
+      break;
+
+    case DW_TAG_structure_type:
+    case DW_TAG_class_type:
+    case DW_TAG_union_type:;
+      Dwarf_Die child_mem;
+      switch (dwarf_child (typedie, &child_mem))
+	{
+	default:
+	  return -1;
+
+	case 1:			/* No children: empty struct.  */
+	  break;
+
+	case 0:;		/* Look at each element.  */
+	  int max_used = fpregs_used;
+	  do
+	    switch (dwarf_tag (&child_mem))
+	      {
+	      case -1:
+		return -1;
+
+	      case DW_TAG_member:;
+		Dwarf_Die child_type_mem;
+		Dwarf_Die *child_typedie
+		  = dwarf_formref_die (dwarf_attr_integrate (&child_mem,
+							     DW_AT_type,
+							     &attr_mem),
+				       &child_type_mem);
+		Dwarf_Word child_size;
+		if (dwarf_aggregate_size (child_typedie, &child_size) != 0)
+		  return -1;
+		if (tag == DW_TAG_union_type)
+		  {
+		    int used = hfa_type (child_typedie, child_size,
+					 locp, fpregs_used);
+		    if (used < 0 || used > 8)
+		      return used;
+		    if (used > max_used)
+		      max_used = used;
+		  }
+		else
+		  {
+		    fpregs_used = hfa_type (child_typedie, child_size,
+					    locp, fpregs_used);
+		    if (fpregs_used < 0 || fpregs_used > 8)
+		      return fpregs_used;
+		  }
+	      }
+	  while (dwarf_siblingof (&child_mem, &child_mem) == 0);
+	  if (tag == DW_TAG_union_type)
+	    fpregs_used = max_used;
+	  break;
+	}
+      break;
+
+    case DW_TAG_array_type:
+      if (size == 0)
+	break;
+
+      Dwarf_Die base_type_mem;
+      Dwarf_Die *base_typedie
+	= dwarf_formref_die (dwarf_attr_integrate (typedie, DW_AT_type,
+						   &attr_mem),
+			     &base_type_mem);
+      Dwarf_Word base_size;
+      if (dwarf_aggregate_size (base_typedie, &base_size) != 0)
+	return -1;
+
+      int used = hfa_type (base_typedie, base_size, locp, 0);
+      if (used < 0 || used > 8)
+	return used;
+      if (size % (*locp)[1].number != 0)
+	return 0;
+      fpregs_used += used * (size / (*locp)[1].number);
+      break;
+
+    default:
+      return 9;
+    }
+
+  return fpregs_used;
+}
+
+int
+ia64_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
+{
+  /* Start with the function's type, and get the DW_AT_type attribute,
+     which is the type of the return value.  */
+  Dwarf_Die die_mem, *typedie = &die_mem;
+  int tag = dwarf_peeled_die_type (functypedie, typedie);
+  if (tag <= 0)
+    return tag;
+
+  Dwarf_Word size;
+  switch (tag)
+    {
+    case -1:
+      return -1;
+
+    case DW_TAG_subrange_type:
+      if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
+	{
+	  Dwarf_Attribute attr_mem, *attr;
+	  attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
+	  typedie = dwarf_formref_die (attr, &die_mem);
+	  tag = DWARF_TAG_OR_RETURN (typedie);
+	}
+      /* Fall through.  */
+
+    case DW_TAG_base_type:
+    case DW_TAG_enumeration_type:
+    case DW_TAG_pointer_type:
+    case DW_TAG_ptr_to_member_type:
+      {
+	Dwarf_Attribute attr_mem;
+	if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
+						   &attr_mem), &size) != 0)
+	  {
+	    if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
+	      size = 8;
+	    else
+	      return -1;
+	  }
+      }
+
+      if (tag == DW_TAG_base_type)
+	{
+	  Dwarf_Attribute attr_mem;
+	  Dwarf_Word encoding;
+	  if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
+						     &attr_mem),
+			       &encoding) != 0)
+	    return -1;
+
+	  switch (encoding)
+	    {
+	    case DW_ATE_float:
+	      switch (size)
+		{
+		case 4:		/* float */
+		  *locp = loc_fpreg_4;
+		  return nloc_fpreg;
+		case 8:		/* double */
+		  *locp = loc_fpreg_8;
+		  return nloc_fpreg;
+		case 10:       /* x86-style long double, not really used */
+		  *locp = loc_fpreg_10;
+		  return nloc_fpreg;
+		case 16:	/* long double, IEEE quad format */
+		  *locp = loc_intreg;
+		  return nloc_intregs (2);
+		}
+	      return -2;
+
+	    case DW_ATE_complex_float:
+	      switch (size)
+		{
+		case 4 * 2:	/* complex float */
+		  *locp = loc_fpreg_4;
+		  return nloc_fpregs (2);
+		case 8 * 2:	/* complex double */
+		  *locp = loc_fpreg_8;
+		  return nloc_fpregs (2);
+		case 10 * 2:	/* complex long double (x86-style) */
+		  *locp = loc_fpreg_10;
+		  return nloc_fpregs (2);
+		case 16 * 2:	/* complex long double (IEEE quad) */
+		  *locp = loc_intreg;
+		  return nloc_intregs (4);
+		}
+	      return -2;
+	    }
+	}
+
+    intreg:
+      *locp = loc_intreg;
+      if (size <= 8)
+	return nloc_intreg;
+      if (size <= 32)
+	return nloc_intregs ((size + 7) / 8);
+
+    large:
+      *locp = loc_aggregate;
+      return nloc_aggregate;
+
+    case DW_TAG_structure_type:
+    case DW_TAG_class_type:
+    case DW_TAG_union_type:
+    case DW_TAG_array_type:
+      if (dwarf_aggregate_size (typedie, &size) != 0)
+	return -1;
+
+      /* If this qualifies as an homogeneous floating-point aggregate
+	 (HFA), then it should be returned in FP regs. */
+      int nfpreg = hfa_type (typedie, size, locp, 0);
+      if (nfpreg < 0)
+	return nfpreg;
+      else if (nfpreg > 0 && nfpreg <= 8)
+	return nfpreg == 1 ? nloc_fpreg : nloc_fpregs (nfpreg);
+
+      if (size > 32)
+	goto large;
+
+      goto intreg;
+    }
+
+  /* XXX We don't have a good way to return specific errors from ebl calls.
+     This value means we do not understand the type, but it is well-formed
+     DWARF and might be valid.  */
+  return -2;
+}